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Summary of Significant Accounting Policies - Common Stock and Convertible Stock Dilutive in Computation of Earning Per Share (Detail) - $ / shares
shares in Thousands
 5 Months Ended 7 Months Ended 12 Months Ended
Dec. 31, 2018
Aug. 13, 2018
Dec. 31, 2020
Dec. 31, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Weighted average PSUs 328 476 632 0
Weighted average grant date fair value per unit $ 12.93 $ 13.83 $ 9.33 $ 0
Weighted average convertible preferred stock 0 0 63,832 0
Weighted average warrants for common stock (in shares) 0 142 0 0
Weighted average contingently convertible shares (in shares) 0 39,819 0 0
Common Stock Warrants        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Weighted average price per share (in us dollar per share) $ 0 $ 0.01 $ 0 $ 0
Contingently Convertible Shares        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Weighted average price per share (in us dollar per share) $ 0 $ 12.32 $ 0 $ 0